exception handling

except_inheritance.rb

class MyExc < StandardError;end
class MyExc1 < MyExc;end
class Foo

   def initialize params={}
    params.each {
       |k,v|
       instance_variable_set "@#{k}",v
    }
   end
   def yay; raise MyExc1, "what";end
end



f = Foo.new(a: 10, b: 2); p f
begin
   f.yay
rescue MyExc => e
  p e.message, e.class
end
'
#<Foo:0x00000000dab740 @a=10, @b=2>
"what"
MyExc1